The medium arrives on the cobbles to tell Audrey Roberts (Sue Nicholls) that not only is she in contact with her dead husband Alf, but she also has a message for Audrey’s daughter Gail (Helen Worth) from her dead husbands.

Despite reservations from her daughter and Maria Connor (Samia Longchambon), who tell her Rosemary is a fake, Audrey is convinced she is the real thing and makes a booking with her.

Thompson, who played Mafalda Hopkirk in the Harry Potter films, has also appeared in Detectorists, Bounty Hunters and Inside No 9.